/* 下滑进入 */

.u-slide-down-enter-active,
.u-slide-down-enter-to-active,
.u-slide-down-leave-active,
.u-slide-down-leave-to-active
{
    transition-property: all;
}

.u-slide-down-enter,
.u-slide-down-leave-to
{
    transform: translate3d(0, -100%, 0);
}

.u-slide-down-enter-to,
.u-slide-down-leave
{
    transform: translate3d(0, 0, 0);
}